He definitely looks Asian to me and is "qualified" in that sense to represent. Most importantly, he also recognizes himself as such and makes it a point to state that it's a huge part of his identity. I don't think anyone should try to take that away from him.
He could definitely pass as someone who is fully Southeast Asian or East Asian. In the West, he's definitely perceived as an Asian person.
Since your PP is Bambam, it reminds me of when people knew Bambam's heritage is technically Chinese (there is a lot of Han Chinese in Thailand) many western fans started saying "Then he's not Thai!" Which really grinds my gears because being Chinese does not mean you cancel out the country or the region you are born in.